Optical recording medium and recording and/or reproducing method and apparatus employing the optical recording medium
CA 2312124 A1 · Owner: Sony Corporation · Inventors: Yasuda, Akio; Yamamoto, Masanobu; Sabi, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical recording medium is capable of linear recording in a photon mode. An organic material changed in molecular orientation on light illumination to exhibit, birefringence is used as a recording material. For example a recording layer , having, as a recording material an organic material changed in molecular orientation caused, by trans-cis rearrangement, is changed in birefringence with changes in the molecular, orientation of the organic material. The recording system which utilizes the changes, in the molecular orientation of the organic material has linear characteristics and gives, outputs different depending on e.g. the degree or the angle of orientation thus, enabling …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2022.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.